I don't think you read the article. You don't need to do anything extra for Spartan.

Can you explain what circumstances require that you support IE7?

I work for a company that has a "managing" application that runs on windows. This application has a browser plugin that runs in an equivalent IE7 environment which must be supported.

Unfortunately that is what you get with proprietary sometimes.

I always hear about these applications but I've never actually seen one.

If he's a developer for a company that still has apps that require IE7, then he needs to support IE7. It doesn't need to be on the public Internet at all.

Your case is isolated, IE7 is pretty much dead.

IE7 has had very little usage outside of enterprise for a few years now. If you're screwed by your job, sorry. Maybe all those well-paid people can come up with an upgrade plan.